Currently, on the cRIO-903x series controllers, the Chassis Temperature and the USER1 push button are only available on the FPGA http://digital.ni.com/public.nsf/allkb/75E039282A8B691886257E450049C7B6 and require the chassis to operate in a Hybrid Mode in order to use both the Scan interface and those chassis I/O options.
The cRIO-902x series allowed for both of these I/O options to be accessed in the real-time OS directly. This small feature would add convenience on the cRIO-903x series controllers.
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LV 6.1 to 2015 SP1